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Sea butterflies

Animal
The Thecosomata, or sea butterflies, are a taxonomic suborder of small, pelagic, free-swimming sea snails known as holoplanktonic opisthobranch gastropod mollusks, in the order Pteropoda. Most pteropods have some form of calcified shell, although... Wikipedia
Scientific name: Thecosomata
Class: Gastropoda
Phylum: Mollusca
Domain: Eukaryota
Kingdom: Animalia
Order: Pteropoda
Lower classifications